Heading Indicator | Wander

Question 1

Even on the ground, the DGI will change its heading at ___ degrees per hour

Answer 1

15

Question 2

Real wander is AKA ___ wander

Answer 2

mechanical

Question 3

Real wander comes from ___ in the bearings, power fluctuations, and other ___

Answer 3

friction imperfections

Question 4

Real wander is ___ and can be measured only be checking the heading

Answer 4

unpredicatble

Question 5

Real wander is sometimes called ___ wander

Answer 5

random

Question 6

A ___ gyro has no random wander

Answer 6

perfect

Question 7

Apparent wander is where the spin axis remains aligned to a point ___ ____ as the plane of reference changes, making the gyro appear to precess

Answer 7

in space

Question 8

Earth rate is _ to _

Answer 8

N S

Question 9

Earth rate is __ degrees per hour at the poles

Answer 9

15

Question 10

Earth rate is ___ at the Equator

Answer 10

0

Question 11

Earth rate varies with the ___ of latitude

Answer 11

sin

Question 12

Earth rate is ___ in the N Hemisphere, ___ in the S Hemisphere

Answer 12

Right Left

Question 13

The sign is ___ in the N Hemisphere

Answer 13

-

Question 14

Apparent drift is corrected for with a ___

Answer 14

latitude nut

Question 15

Transport wander is the phenomena where the spin axis appears to move because you are crossing ___ and ___ becomes a factor

Answer 15

meridians and convergency

Question 16

Flight to the West will cause ___reading in the Northern Hemisphere

Answer 16

over

Question 17

Flight to the East will cause ___reading in the Northern Hemisphere

Answer 17

under

Question 18

Eastward flight ___ the apparent drift because the gyro is rotating faster than the speed of the Earth

Answer 18

increases

Question 19

Latitude nut introduces an equal and opposite precession force to counteract ___ drift

Answer 19

apparent

Question 20

Latitude nut introduces ___ wander to correct for fine drift

Answer 20

real

Question 21

When wound outwards, the latitude nut exerts a ___ force against the balance weight on the other side of the inner gimbal, where it is mounted.

Answer 21

greater

Question 22

Without any other influence, going North of the preset latitude causes the DGI to ___read, South to ___read

Answer 22

under over

Question 23

Total Gyro Drift =

Answer 23

Earth Rate + Transport Wander + Latitude Nut + Random or Real Wander

Question 24

Earth Rate =

Answer 24

15 x Sin( Latitude per Hour )

Question 25

Transport Wander =

Answer 25

ChLong x Sin( Latitude per Hour )
or
( Gs x Tan( Latitude ) )
60

Question 26

Latitude nut =

Answer 26

15 x Sin( Latitude setting )

Question 27

In the Northern Hemisphere, Earth rate is _

Answer 27

-

Question 28

In the Northern Hemisphere, Latitude Nut is _

Answer 28

+

Question 29

In the Northern Hemisphere, Transport Wander East is _ and West is _

Answer 29

• +

Question 30

In the Southern Hemisphere, Earth rate is _

Answer 30

+

Question 31

In the Southern Hemisphere, Latitude Nut is _

Answer 31

-

Question 32

In the Southern Hemisphere, Transport Wander East is _ and West is _

Answer 32

+ -

Question 33

On a DGI, gross topple is corrected with a ___ ___

Answer 33

caging knob